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    <title>利用Babel转ES6为ES5</title>
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    <!-- 
        1.安装工具babel-cli babel-preset-env browserify(webpack)
        2.npx babel src/js -d dist/js --presets=babel-preset-env
        3.打包 npx browserify dist/js/app.js -o dist/bundle.js
     -->

    <script src="./dist/bundle.js"></script>
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